Method of measuring charge distribution of nanosized aerosols.
Method of measuring charge distribution of nanosized aerosols.
复制标题
测量纳米气溶胶电荷分布的方法。
DOI：
10.1016/j.jcis.2004.08.066
复制
发表时间：
2005
影响因子：
9.9
通讯作者：
Michael R. Zachariah
中科院分区：
文献类型：
--
作者：
Soo Hyung Kim;K. Woo;Benjamin Y. H. Liu;Michael R. Zachariah
在本文中，我们提出了一种方法来准确地测量纳米气溶胶的正，负电荷分布的串联差分迁移率分析仪（TDMA）系统的发展。从一系列的TDMA测量，纳米尺寸的气溶胶颗粒的电荷分数作为等效迁移率粒径范围从50至200 nm的函数获得。这种新方法的能力是通过从层流扩散火焰中取样来实现的，该火焰由于自然发生的火焰电离过程而提供了高度带电的颗粒源。TDMA测量的结果提供了纳米尺寸气溶胶的电荷分布，我们发现其与Boltzmann平衡电荷分布理论和基于电荷布居平衡方程（PBE）结合Fuchs理论的理论（N.A.福克斯，吉奥菲斯。Pura Appl.56（1963）185）。基于PBE的气溶胶粒子的电荷分布的理论估计提供了洞察双极离子和电子包围的纳米气溶胶的充电过程，并同意与TDMA的结果。
In this paper, we present the development of a method to accurately measure the positive and negative charge distribution of nanosized aerosols using a tandem differential mobility analyzer (TDMA) system. From the series of TDMA measurements, the charge fraction of nanosized aerosol particles was obtained as a function of equivalent mobility particle diameter ranging from 50 to 200 nm. The capability of this new approach was implemented by sampling from a laminar diffusion flame which provides a source of highly charged particles due to naturally occurring flame ionization process. The results from the TDMA measurement provide the charge distribution of nanosized aerosols which we found to be in reasonable agreement with Boltzmann equilibrium charge distribution theory and a theory based upon charge population balance equation (PBE) combined with Fuchs theory (N.A. Fuchs, Geofis. Pura Appl. 56 (1963) 185). The theoretically estimated charge distribution of aerosol particles based on the PBE provides insight into the charging processes of nanosized aerosols surrounded by bipolar ions and electrons, and agree well with the TDMA results.